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Double network composite hydrogel and its preparation method and oil-water separator

A composite hydrogel and double network technology, applied in the field of materials, can solve the problems of high swelling rate and irreparableness of hydrogel coatings, and achieve the effects of low self-healing effect, excellent tensile properties and long service life.

Active Publication Date: 2020-09-11
合肥龙智机电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first purpose of the present invention is to provide a method for preparing a double-network composite hydrogel, which solves the problems in the prior art that the hydrogel coating has a high swelling rate and cannot be repaired after damage

Method used

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  • Double network composite hydrogel and its preparation method and oil-water separator
  • Double network composite hydrogel and its preparation method and oil-water separator
  • Double network composite hydrogel and its preparation method and oil-water separator

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preparation example Construction

[0029] A method for preparing a double-network composite hydrogel provided in an embodiment of the present invention includes:

[0030] S1. After mixing acrylamide, acrylic acid, silica nanoparticles and deionized water, stir the mixed solution until it is uniform and transparent to obtain the first solution.

[0031] Further, after mixing the acrylamide, acrylic acid, silica nanoparticles and deionized water, the mixed solution is stirred until uniform and transparent, using ultrasonic stirring.

[0032] Further, ultrasonically stir for 5-20 minutes.

[0033] Further, the amount of acrylamide is 5-20g, the amount of acrylic acid is 5-10g, the mass of deionized water is 5-20g, and the mass of silica nanoparticles is 0.5%-5% of the total amount of acrylamide and acrylic acid.

[0034] Specifically, acrylamide, acrylic acid, silicon dioxide nanoparticles and deionized water were mixed and stirred evenly, then added to a 50ml round bottom flask, ultrasonically stirred for 5 to 2...

Embodiment 1

[0054] A kind of double-network composite hydrogel provided in this embodiment is prepared by the following method:

[0055] Weigh 5g of acrylamide and 3.33g of acrylic acid; dissolve them in 5g of deionized water and add them to a 50ml round bottom flask, then add 0.5% of the total mass of acrylamide and acrylic acid to amino-modified silica nanoparticles under ultrasonic conditions Under full stirring and dispersion for 5 minutes, a uniform and transparent first solution was obtained.

[0056] Then measure 0.01 g of glacial acetic acid, add it to the first solution, adjust its pH to be acidic, add 0.1 g of chitosan therein, and ultrasonically stir for 0.5 hour, so that all the chitosan is dissolved to obtain a viscous second solution.

[0057] After passing nitrogen gas under magnetic stirring, 2-hydroxy-2-methylpropiophenone was added as a photoinitiator, sealed in a transparent mold and placed under sunlight for one day, and then polymerized to form a double-network compos...

Embodiment 2

[0061] A kind of double-network composite hydrogel provided in this embodiment is prepared by the following method:

[0062] Weigh 20g of acrylamide and 8.57g of acrylic acid; dissolve them in 20g of deionized water and add them to a 50ml round bottom flask, then add amino-modified silica nanoparticles with 5% of the total mass of acrylamide and acrylic acid under ultrasonic conditions Under full stirring and dispersion for 20 minutes, a uniform and transparent first solution was obtained.

[0063] Then measure 0.5 g of glacial acetic acid, add it to the first solution, adjust its pH to be acidic, add 1 g of chitosan therein, and ultrasonically stir for 3 hours, so that all the chitosan is dissolved to obtain a viscous second solution.

[0064] After passing nitrogen gas under magnetic stirring, add 2-hydroxy-4-(2-hydroxyethoxy)-2-methylpropiophenone as a photoinitiator, seal it in a transparent mold and place it under sunlight for one day, and polymerize to form Double netwo...

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Abstract

The invention relates to the field of materials, in particular to double-network composite hydrogel, a preparation method of the double-network composite hydrogel, and an oil-water separator. According to the method, an amino modified silicon dioxide nanoparticle, an acrylamide-acrylic acid copolymer and chitosan are cross-linked into a double-network structure by two pure physical effects of a hydrogen bond and an ionic bond; the double-network composite hydrogel has excellent tensile and underwater super-lipophobic properties, a certain self-repairing effect and a smaller swelling ratio; andthe oil-water separator prepared by coating a copper net with the double-network composite hydrogel is long in life and difficult to damage. The tensile strain of the double-network composite hydrogel is 1500-2000%; the tensile stress is 400-450kpa; a self-healing effect is obvious; the swelling ratio is smaller; and an underwater contact angle reaches 164 DEG. The separation efficiency of the oil-water separator on an oil-water mixture reaches 99.71%, and the hydrogel is an oil-water separation material with good development prospects.

Description

technical field [0001] The invention relates to the field of materials, in particular to a double-network composite hydrogel, a preparation method thereof, and an oil-water separator. Background technique [0002] At present, energy and environmental issues are still serious problems facing the development of human society. Since oil is one of the most important sources of energy for human beings, and the increase in industrial oily wastewater and frequent oil spills around the world from time to time, the environment There is a strong need for materials that can effectively separate oil and water from economic and economic needs. Scientists from all over the world have developed various solutions, among which the preparation and use of oil-water separators is one of the most effective and convenient methods. [0003] Hydrophilic and underwater superoleophobic hydrogel coating grids in an oil / water / solid three-phase system, constructed from rough nanostructured hydrogel coat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F2/48C08K9/04C08K3/36C08L33/26C08L5/08B01D17/022
CPCB01D17/0202C08F2/48C08F220/56C08K3/36C08K9/04C08K2201/011C08L5/08C08L33/26C08F220/06
Inventor 何培新张玉红刘勇苏铭吉
Owner 合肥龙智机电科技有限公司
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